1941
Montana. State Highway Commission.
1:127k
1878
Twining, W.J.
1:507k
1935
1:500k
1927
Rand McNally and Company
1:2m
1933
Mid-West Map Company
1:1m
1901
Murray-Aaron, Eugene, 1852-1941.
1:1m
1939
Rand McNally and Company
1:1
1920
George F. Cram Company collection 1845-1955; National Highways Association
1:2m
1944
State Farm Insurance Companies Travel Bureau
1:1m
1935
White, Ruth Taylor